They're all on the schematic if you know enough to be able to read the schematic.

But to summarize, there's a power LED and a status LED by the reset button. Two LED's near the USB chip for transmit and receive on the USB port. And the rest indicate when their respective mosfet outputs are enabled.

I think the Status LED will flash when you press the reset button to let you know it's resetting/reset.The flashing LED lets you know the Bootloader is loading... I think a bootloader is essentially like a computer BIOS for the board.. but I could be wrong?Also I believe you'll be able to program it to perform whatever function you decide you want to assign to it and what you want it to indicate... useful debugging tool id guess?

The Arduino stuff looks really interesting to me, the coding side looks simple enough and logically how it all works seems ok that I thinki'll buy some stuff to play with as I've limited base level electronics experience. Looks like fun and a good fit with 3D Printingcoupled with as far as I can tell the Rambo board is just a different flavour Arduino board?

awander wrote:Yeah, I already had that doc, but thanks for posting it.

What is the function of the status LED?

It's the utility LED on digital pin 13 found on nearly every general purpose Arduino since day one. If you loaded the arduino blink program, that's the LED that would blink. That pin isn't connected to any rambo hardware besides the LED itself, but is broken out on the pwm header.

On the Arduino the bootloader is the program that runs first. It is the part of the program that enables you to program the arduino over the usb (virtual serial) port using the Arduino IDE (interactive development environment, fancy word for arduino softeare). It consumes about 2kb of your microcontrollers memory ( which should be 32kb). You can do without it BUT then you would need to purchase a separate programmer device to program the thing.